289 (number)

← 288 289 290 →
← 200 210 220 230 240 250 260 270 280 290 → List of numbers Integers ← 0 100 200 300 400 500 600 700 800 900 →
Cardinal	two hundred eighty-nine
Ordinal	289th (two hundred eighty-ninth)
Factorization	172
Divisors	1, 17, 289
Greek numeral	ΣΠΘ´
Roman numeral	CCLXXXIX, cclxxxix
Binary	1001000012
Ternary	1012013
Senary	12016
Octal	4418
Duodecimal	20112
Hexadecimal	12116

289 is the natural number following 288 and preceding 290.

In mathematics

• 289 is an odd composite number with only one prime factor. ^[1]
• 289 is the 9th Friedman number. Friedman numbers are numbers that can be written by using its own digits the exact number of times they show up in the number. This one can be expressed as (8+9)². ^[2]
• 289 is a perfect square being equal to 17². It is also the 7th number to only have 3 factors because it is a square of a prime number.
• 289 is the sum of perfect cubes. It is the sum of 1³+2³+4³+6³.
• 289 is equivalent to the sum of the first 5 whole numbers to their respective powers. It is equal to 0⁰+1¹+2²+3³+4⁴.

References

1. "Facts about the integer". mathworld.wolfram.com.
2. "Friedman numbers" (PDF). illuminations.nctm.org.

External links

Media related to 289 (number) at Wikimedia Commons